I would have preferred that our president had taken up this unpleasant task of criticising your mischievous efforts to vulgarize our beautiful science, which, like the true religion of the Egyptians, should be retained _sub rosa_ in the temples; but she, as you yourself have said, does not like controversial publicity, and has often remarked that our science is like the mushroom, for, though it is the child of darkness and Byzantian filth, it is eminently adapted to be retained by weak stomachs, while for others it may be nauseating. I am, sir, very respectfully, ANACHARSIS PANGLOSS, _M. Plane_. Though religiously refraining from introducing my own personality in the foregoing, it being a cardinal point in our science that it is good form to appear modest--_videri quam esse_, as was said of Cato--I am, nevertheless, obliged to observe that I am not at all in any way related to the Dr. Pangloss, LL. D., A. S. S., mentioned in the play of the Heir at Law, nor yet, though perhaps more spiritually akin, to that other Dr. Pangloss--Dr. Leibnitz Pangloss, the tutor of Candide mentioned by the late Monsieur Voltaire of happy memory. Dr. L. Pangloss, a fine old fellow at bottom, was engaged in showing how, in the best possible words, a cause always precedes its effect; for instance, Monsieur the Baron Thunder den Trockendorf has a nose, argues he--it will carry spectacles, hence the nose was created for spectacles, and spectacles are created. It is plain that Dr. L. Pangloss was a scientist. Now, I am a sociologist, and it is the hope of my life to fill the chair of Monadology in the new American university, where I intend to show that while the rich are becoming richer the poor will become richer than the rich in contemplating how much more satisfaction the rich get out of their riches than they, the poor, get out of their poverty. This, as you will at once recognize, is in the line of what Mr. Lester Ward calls Dynamic Sociology, and, though it is not the acme of the application of dynamics such as that which knocked Hebraism out of Saul of Tarsus, I beg to remind you that, until German science has made further progress in the application of electricity, we lack the means of producing the necessary phenomena by which alone such effects can be secured. A. P. Correspondence. FAITH AND KNOWLEDGE. _Editor Popular Science Monthly_: